so i caught my sister cheating a couple days ago and filmed it. since then ive been blackmailing her for sexual favors, iv gotten her to jerk me off and suck me dry. today im going all in, i want sex from my sister. my parents will be home tomorrow and i promised my sister if she did what i said until then then i would delete the video. so today i told my sister i wanted sex and she didn’t even argue, she striped and dropped to her knees. a little later my sister was bouncing up and down on my dick when her phone rang. she picked it up and i asked her who it was. she said it was her boyfriend and told me be quite. she answered her phone and kept riding my cock, she was actually making small talk with her boyfriend while my dick was inside of her.